Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1GR-FE ENGINE CONTROL
CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121)
READ VALUE USING GTS (ACCEL SENSOR OUT NO.1 AND ACCEL SENSOR OUT NO.2)
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY
CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)
DTC P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance
DESCRIPTION
Refer to DTC P2120 ().
| DTC No. | DTC Detection Condition | Trouble Area |
| P2121 | Either conditions (1) or (2) met for 0.5 seconds (1 trip detection logic): (1) Difference between VPA and VPA2 is less than 0.4 V, or more than 1.2 V. (learned value of accelerator off position) (2) Difference between VPA and VPA2 is greater than or equal to the specified value. | Accelerator pedal sensor assembly ECM |
MONITOR DESCRIPTION
When the difference between the output voltages of VPA and VPA2 deviates from the standard, the ECM determines that the accelerator pedal sensor assembly is malfunctioning. The ECM turns on the MIL and stores the DTC.
FAIL-SAFE
The accelerator pedal position sensor has 2 (main and sub) sensor circuits.
The ECM detects the abnormal signal voltage difference between the 2 sensor circuits and switches to fail-safe mode.
If the either of the 2 sensor circuits malfunctions, the ECM limits the engine output. If both of the circuits malfunction, the ECM regards the accelerator pedal as being released. In this case, the throttle valve remains closed as if the engine is idling.
If a pass condition is detected and then the ignition switch is turned off, the fail-safe operation stops and the system returns to normal.
WIRING DIAGRAM
Refer to DTC P2120 ().
INSPECTION PROCEDURE
- HINT:
| 1.CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121) |
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs.
| Result | Proceed to |
| P2121 is output | A |
| P2121 and other DTCs are output | B |
- HINT:
- If any DTCs other than P2121 are output, troubleshoot those DTCs first.
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| A | |
| 2.READ VALUE USING GTS (ACCEL SENSOR OUT NO.1 AND ACCEL SENSOR OUT NO.2) |
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sensor Out No.1 and Accel Sensor Out No.2.
Read the values displayed on the GTS.
- Standard Voltage:
Accelerator Pedal Operation Accel Sensor Out No.1 Accel Sensor Out No.2 Released 0.5 to 1.1 V 1.2 to 2.0 V Depressed 2.6 to 4.5 V 3.4 to 4.75 V
| *a | Depressed |
| *b | Released |
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| OK | ||
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| 3.REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY |
Replace the accelerator pedal sensor assembly ().
| NEXT | |
| 4.CHECK WHETHER DTC OUTPUT RECURS (DTC P2121) |
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs ().
Start the engine.
Allow the engine to idle for 15 seconds.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs.
| Result | Proceed to |
| P2121 is output | A |
| No DTC is output | B |
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| A | ||
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